How To Set the Timing On A Engine Utilizing A Distributor There are four main steps involved in setting the timing on a normal engine utilizing a distributor. Setting the timing on an engine synchronizes the spark timing with the engine's compression stroke for maximum efficiency. First, pull the vacuum line off of the distributor and plug the end of the line. Next, mark the Top Dead Centre (TDC) mark on the harmonic balancer (the round piece on the front of the engine) with chalk. In addition, it is a good idea to chalk the correct mark for the number of degrees to which you'll be set